Presence
detect requirements

Presence
detect is the ability to report the size and speed of
the SIMMs installed in an HP LaserJet printer to whomever
is asking for the information. Without presence detect,
the printer would be unable to recognize that additional
memory had been installed.

HP
LaserJet 4L printer

The HP LaserJet
4L printer has a 1-MB memory upgrade. The part number
is: C2024-69001.